Extended Bonnet
An elongated bonnet that places the packing/stuffing box away from the extreme temperature of the process fluid. Used for cryogenic valves (cold box prevents ice bridging the stem) and high-temperature valves (heat dissipation protects packing). Standard for LNG and boiler applications.
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What is a Extended Bonnet in a valve?
An elongated bonnet that places the packing/stuffing box away from the extreme temperature of the process fluid. Used for cryogenic valves (cold box prevents ice bridging the stem) and high-temperature valves (heat dissipation protects packing). Standard for LNG and boiler applications.
What materials are used for the Extended Bonnet?
Extended Bonnet material selection depends on the process fluid, operating temperature and pressure, and required corrosion resistance. Standard materials include carbon steel (A216 WCB/A105), austenitic stainless steel (SS316/316L), and corrosion-resistant alloys (Hastelloy C-276, Inconel 625, duplex stainless steel 2205/2507) for aggressive service. All materials must be certified with EN 10204 Type 3.1 MTCs traceable to the heat number.
What standards govern the design of the Extended Bonnet?
Valve component design is governed by ASME B16.34 for pressure-temperature ratings, API 600/602 for gate valves, API 609 for butterfly valves, and API 6D for pipeline valves, as applicable. Third-party inspection to these standards ensures compliance. Vajra Industrial Solutions supplies valves with full documentation packages including dimensional inspection records and material certificates.
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